Filter



FIG. 1 is a side elevational view of a filter showing my new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front side elevational view thereof, the rear elevational side view being a mirror image thereto; and,

FIG. 5 is a top plan view thereof.

The broken line showing of the collection tubes in the FIGS. 1 and 2 are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a filter, as shown and described. 